I had been thinking "Aww Bones is smiling cause it's sweet and he thinks Spock is just adorable" and then I reread 'Christmas morning' and went "Nope. Bones is smiling cause he just found excellent Spock fight ammo.
Yoda and Obi-wan catch on after a while, but they continue to come because one time they didn't and Anakin went on to tell Luke every embarrassing story about the Jedi council members that he could think of.
The Time Lords are the Weeping Angels theory. and This Was His Mom theory. I was actually thinking that that was his mom the first time I saw this episode, but I never thought of the weeping angels one.